<svg xmlns:xlink="http://www.w3.org/1999/xlink" 
     xmlns="http://www.w3.org/2000/svg"
     onload="boom();">

  <script type="text/javascript">
  
  function boom()
  {
    var a = document.getElementById("a");
    var b = document.getElementById("b");
    var d = document.getElementById("d");

    d.appendChild(b);
    a.appendChild(document.createTextNode("A"));
  }

  </script>

  <g id="a"></g>

  <use xlink:href="#a" id="b"/>

  <use xlink:href="#d">
    <g id="d"/>
  </use>
  
</svg>
